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Polymers 2016, 8(10), 364; doi:10.3390/polym8100364

Relaxation Oscillation with Picosecond Spikes in a Conjugated Polymer Laser

1
Department of Physics and Astronomy, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
2
Research Chair on Laser Diagnosis of Cancers, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
*
Author to whom correspondence should be addressed.
Academic Editor: Ping Xu
Received: 29 August 2016 / Revised: 29 September 2016 / Accepted: 8 October 2016 / Published: 14 October 2016
(This article belongs to the Special Issue Conjugated Polymers 2016)
View Full-Text   |   Download PDF [5982 KB, uploaded 14 October 2016]   |  

Abstract

Optically pumped conjugated polymer lasers are good competitors for dye lasers, often complementing and occasionally replacing them. This new type of laser material has broad bandwidths and high optical gains comparable to conventional laser dyes. Since the Stokes’ shift is unusually large, the conjugated polymer has a potential for high power laser action, facilitated by high concentration. This paper reports the results of a new conjugated polymer, the poly[(9,9-dioctyl-2,7-divinylenefluorenylene)-alt-co-{2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}](PFO-co-MEH-PPV) material, working in the green region. Also discussed are the spectral and temporal features of the amplified spontaneous emissions (ASE) from the conjugated polymer PFO-co-MEH-PPV in a few solvents. When pumped by the third harmonic of the Nd:YAG laser of 10 ns pulse width, the time-resolved spectra of the ASE show relaxation oscillations and spikes of 600 ps pulses. To the best of our knowledge, this is the first report on relaxation oscillations in conjugated-polymer lasers. View Full-Text
Keywords: conjugated polymer (PFO-co-MEH-PPV); green laser; relaxation oscillations; amplified spontaneous emission spectra (ASE); picoseconds spikes conjugated polymer (PFO-co-MEH-PPV); green laser; relaxation oscillations; amplified spontaneous emission spectra (ASE); picoseconds spikes
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mujamammi, W.M.; Prasad, S.; AlSalhi, M.S.; Masilamani, V. Relaxation Oscillation with Picosecond Spikes in a Conjugated Polymer Laser. Polymers 2016, 8, 364.

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